What is CVE-2026-12411?

CVE-2026-12411 is a high-severity vulnerability in Canonical Lxd, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.4/10. Published 2026-06-26.

How severe is CVE-2026-12411?

High severity. CVSS v3 base score is 8.4 out of 10.

Auth bypass in Canonical Lxd

CVE-2026-12411

Broken Access Control in the devLXDInstancePatchHandler component of Canonical LXD allows an untrusted guest to mount, read, and overwrite another guest's custom storage volume via a crafted device PATCH request over /dev/lxd when security…

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

Affected products

Canonical Lxd — versions 6.6

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key
CWE-862 — Missing Authorization

References

security@ubuntu.com (vendor-advisory, vdb-entry)
security@ubuntu.com (patch)

Frequently asked questions

What is CVE-2026-12411?: CVE-2026-12411 is a high-severity vulnerability in Canonical Lxd, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.4/10. Published 2026-06-26.
How severe is CVE-2026-12411?: High severity. CVSS v3 base score is 8.4 out of 10.